Roseau
Dominica
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Roseau, Dominica

A calm, clear waterfront in the valley city of Roseau, Dominica, with mountains afar
A calm, clear waterfront in the valley city of Roseau, Dominica, with mountains afar
August, the last month of the summer, in Roseau, is another hot month, with temperature in the range of an average low of 24°C (75.2°F) and an average high of 31°C (87.8°F).

Temperature

The warmest months are May through October, with an average high-temperature of 31°C (87.8°F).

Rainfall

In Roseau, in August, during 20 rainfall days, 246mm (9.7") of precipitation is typically accumulated. Throughout the year, in Roseau, there are 218 rainfall days, and 1996mm (78.6") of precipitation is accumulated.

Sea temperature

In August, the average sea temperature is 28°C (82.4°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In August, the average length of the day is 12.6h.

Sunshine

Months with the most sunshine in Roseau are March through August, with an average of 8h of sunshine.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index estimate of 11, and higher, represents an extreme threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
In August, the average maximum UV index of 12 translate into the following recommendations:
Take all necessary precautions, as unprotected skin can burn in minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What are the warmest months in Roseau?

Warmest months are May through October, with an average high-temperature of 31°C (87.8°F).

What is the temperature in August in Roseau?

In Roseau, Dominica, in August, the average high-temperature is 31°C (87.8°F), and the average low-temperature is 24°C (75.2°F).

How many days does it rain in August in Roseau?

In August, in Roseau, Dominica, the rain falls for 20 days. Throughout August, 246mm (9.7") of precipitation is accumulated.

What is the water temperature in August in Roseau?

In Roseau, the average seawater temperature in August is 28°C (82.4°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in August in Roseau?

In August, the average length of the day in Roseau is 12.6h.

What is the month with the most sunshine in Roseau?

March through August, with an average of 8h of sunshine, are months with the most sunshine in Roseau, Dominica.

How long on average sun shines in August in Roseau?

The average sunshine in August in Roseau is 8h.

What is the month with the highest UV index in Roseau?

March through September, with an average maximum UV index of 12, are months with the highest UV index in Roseau.

What is the UV index reading in August in Roseau?

In August, the average daily maximum UV index in Roseau, Dominica, is 12. A UV Index reading of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV radiation.
Average temperature in August - Roseau, Dominica
  • Average high temperature in August: 31°C

Warmest months (with the highest average high temperature) are May, June, July, August, September and October (31°C).
Months with the lowest average high temperature are January, February and December (29°C).

  • Average low temperature in August: 24°C

The month with the highest average low temperature is August (24°C).
Coldest months (with the lowest average low temperature) are January, February, March and December (21°C).

Average rainfall in August - Roseau, Dominica
  • Average rainfall in August: 246mm

The wettest month (with the highest rainfall) is November (252mm).
Driest months (with the lowest rainfall) are February and April (87mm).

Average rainfall days in August - Roseau, Dominica
  • Average rainfall days in August: 20 days

The month with the highest number of rainy days is September (23 days).
Months with the lowest number of rainy days are February and April (14 days).

Average sea temperature in August - Roseau, Dominica
  • Average sea temperature in August: 28°C

Best months for swimming (with the highest average sea temperature) are September and October (29°C).
Coldest months (with the lowest average sea temperature) are February and March (26°C).

Average daylight in August / Average sunshine in August - Roseau, Dominica
  • Average daylight in August: 12.6h

The month with the longest days is June (Average daylight: 13h).
The month with shortest days is December (Average daylight: 11.2h).

  • Average sunshine in August: 8h

Months with most sunshine are March, April, May, June, July and August (Average sunshine: 8h).
Months with least sunshine are January, February, September, October, November and December (Average sunshine: 7).

Average UV index in August - Roseau, Dominica
  • Average UV index in August: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 8).